A5055244645- Soil and Unsaturated Flow
- Fire effects on ecosystems
- Plant Water Relations and Carbon Dynamics
- Soil Carbon and Nitrogen Dynamics
- Groundwater flow and contamination studies
- Landfill Environmental Impact Studies
- Landslides and related hazards
- Surface Modification and Superhydrophobicity
- Soil erosion and sediment transport
- Peatlands and Wetlands Ecology
- Particle Dynamics in Fluid Flows
- Soil and Water Nutrient Dynamics
- Clay minerals and soil interactions
- Fecal contamination and water quality
- Soil Geostatistics and Mapping
- Soil Moisture and Remote Sensing
- Tree Root and Stability Studies
- Microbial Community Ecology and Physiology
- Iron oxide chemistry and applications
- Hydrology and Sediment Transport Processes
- Aeolian processes and effects
- Hydrocarbon exploration and reservoir analysis
- Enhanced Oil Recovery Techniques
- CO2 Sequestration and Geologic Interactions
- Soil Mechanics and Vehicle Dynamics
Leibniz University Hannover
2015-2024
Paderborn University
2022
Klinik und Poliklinik für Hals-, Nasen-, Ohrenheilkunde
2021
Leibniz University of Applied Sciences
2013
Nottingham Trent University
2009
Technion – Israel Institute of Technology
2008
Institute of Soil Science
2002
Bayer (United States)
1987
Earth system models associate the ongoing global warming with increasing frequency and intensity of extreme events such as droughts heat waves. The carbon balance soils may be more sensitive to impact extremes than homogeneously distributed changes in soil temperature (Ts) or water content (θs). One parameter influenced by pronounced drying/rewetting cycles increases Ts is wettability soils. Results from laboratory field studies showed that low θs, particularly combination high can increase...
Because most methods for assessing the wettability of porous materials are restricted in their applicability, we developed two new measuring contact angles and particle surface energy. The proposed (the Wilhelmy plate method (WPM) modified capillary rise (MCRM)) were tested on 24 soils. For comparison, water drop penetration time test (WDPTT) sessile (SDM) also applied. It was found that advancing angles, measured either with WPM or MCRM, agreed well range 0° to 142°. Sessile within domain...
Existing methods for determining the soil–water contact angle as a measure of water repellency are either indirect, cumbersome, or time‐consuming. Our objective was to develop method that is simpler than existing procedures and still yields accurate results. The proposed represents modified sessile drop measuring initial powdered granular material. measurements made by placing layer uniform soil particles onto adhesive tape, adding droplets deionized water, reading off at three‐phase...
Abstract The protective impact of aggregation on microbial degradation through separation has been described frequently, especially for biotically formed aggregates. However, to date little information exists the effects organic‐matter (OM) quantity and OM quality physical protection, i.e. , reduced degradability by microorganisms caused factors. In present paper, we hypothesize that soil wettability, which is significantly influenced OM, may act as a key factor stabilization it controls...
The impact of conversion process parameters in pyrolysis (maximum temperature, inert gas flow rate) and hydrothermal carbonization residence time post-washing) on biochar hydrochar properties is investigated. Pine wood (PW) corn digestate (CD), with low high inorganic species content respectively, are used as feedstock. CD biochars show lower H/C ratios, thermal recalcitrance total specific surface area than PW biochars, but higher mesoporosity. present naphthalene phenanthrene contents,...
Environmental contamination with microplastics (MP, 0.1 µm – 5 mm diameter) potentially threatens various soil functions and agricultural production. In this study we evaluated the effects of MP on physical parameters (saturated hydraulic conductivity, water retention repellency) at concentrations (0.5 to 2 % w/w) that have been reported for farmland soils. Polyethylene terephthalate (PET) polystyrene (PS) three sizes ranging between 0.5 3 diameter, were mixed loess topsoil material from an...
Summary Water repellency can be a significant factor in soil physical behaviour, but little is known about the depth dependence of contact angle field soils. We investigated angles and wetting properties as function for wide range agricultural forest soils Germany. The ranged from silty to sandy texture (six profiles), loamy (eight profiles). Contact (CA) were measured with Wilhelmy plate method (WPM). In most soils, advancing WPM considerably greater than 0° they varied irregularly depth....
Soil wettability affects hydrological processes like infiltration, percolation, preferential flow, and surface runoff. Wettability is related to the soil‐water contact angle, which in turn depends on solid free energy. Little known, however, about angles their dependence soil water potential. The main objective of this study was therefore investigate dynamics angle due variation Aggregate fractions 2‐ 4‐, 1‐ 2‐, <1‐mm diameter corresponding homogenized material a subcritical repellent...
The rhizosphere has a controlling role in the flow of water and nutrients from soil to plant roots; however, its hydraulic properties are not well understood. As roots grow, they change pore size distribution surrounding soil. Roots release polymeric substances such as mucilage into their rhizosphere. Microorganisms living feed on these organic materials other presence might affect retention conductivity during drying rewetting. We used neutron radiography monitor dynamics lupin (Lupinus...
Abstract Root mucilage may play a prominent role in understanding root water uptake and, thus, there is revived interest studying the function of mucilage. However, research hampered by tedious procedures collection. We developed separator which utilizes low centrifugal forces (570 rpm) to separate from seminal roots without need handling individual seeds or removing germinated tray/mesh centrifuge tube. For different plant species, between 1 and 3.7 mL tray −1 hydrated could be produced,...
The capillary pressure (ψ) in unsaturated porous media is known to be a function of temperature ( T ). Temperature affects the surface tension (σ) pore water, but possibly also angle contact (γ). Because information on dependence γ rare, we conducted experiments with three wettable soils and their hydrophobic counterparts. objectives were (i) determine water retention curve (WRC) for water‐repellent soils, (ii) assess effects apparent A derived from those WRCs, (iii) evaluate two models...
In the past, hydrophobic soils have been associated mostly with preferential flow phenomena. It has become increasingly evident that besides phenomena of extremely (hydrophobic) water‐repellent soils, reduced wettability are more rule than exception. Despite extensive literature on hydraulic behavior soil, a conceptual model flexible enough to describe typical wettable and as well for intermediate wetting properties is still missing. We propose water‐content time‐dependent contact angle (CA)...
Summary Wettability of soil affects a wide variety processes including infiltration, preferential flow and surface runoff. The problem determining contact angles energy powders, such as particles, remains unsolved. So far, several theories approaches have been proposed, but formulation interfacial free energy, regards its components, is still very debatable issue. In the present study, general interpretation on chemically heterogeneous rough particle surfaces evaluated by reformulation...
Soil wettability (quantified in terms of contact angle, CA) is crucial for physical, chemical, and biological soil functioning. As the CA determined by components present within outmost nanometer particles, this study applied X-ray photoelectron spectroscopy (XPS) with a maximum analysis depth 10 nm to test relationship between surface elemental composition, using samples from chronosequence where increased 0° (0 yrs) about 98° (120 yrs). Concurrently, as seen XPS, C N content O...